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Is it possible to use the `vcs_version` target as a tag for the `docker_image`target? Do I need to write a small plugin?

I don't think there's a way. But we could add something in the docker backend to support this. Or rather, to support reading tags from a file, and then `vcs_version` can be set up to generate that file.

So then the docker backend doesn't need to know anything about `vcs_version`, which belongs to the python backend

That would be great. Prior to `vcs_version` we were using <https://github.com/pantheon-systems/autotag|https://github.com/pantheon-systems/autotag> to set a env car, then have pants use the env var to tag

So reading tags from a file would actually be a quote flexible and easy to use solution